Int. J. Biosci.10(4), 199-211, April 2017
Contamination of natural and manmade aquatic ecosystems with heavy metals and other pollutants, entering through industrial effluents, agro-chemicals, domestic and city sewage, hospital wastes and other anthropogenic activities, has alarmingly become a matter of disquiet. Fish, being at the top of food chain, has tendency to accumulate excessive amounts of heavy metals and other contaminants from water, which is a severe health concern of human beings. Aquaculture in Pakistan is growing very rapidly and fish available in the markets is mostly coming from fish farms. To assess heavy metals load in farmed fish in markets of metropolitan city Lahore, samples of four farmed carps were randomly collected from main fish market and the retailer’s shops and analyzed for three non-essential heavy metals viz. Cd, Pb and Cr at Fish Quality Control Labs Manawan, Lahore. All tested heavy metals were found positive in selected fish species. Pb concentration was the highest in farmed carps (0.5888±0.1463 µg g-1), followed by Cr (0.0568 ± 0.0016 µg g1) and Cd (0.0258±0.0029 µg g1). Mean Pb concentrations were observed well above the permissible limits of WHO for fish (0.123 µg g-1) while of Cd and Cr were recorded within permissible limits (0.050 and 0.100 µg g-1). Study highlights that farmed fish sold in markets of Lahore metropolitan was polluted with heavy metals, especially of Pbbeyond the WHO limits and was not fit for human consumption. Its prolonged eating in enough quantities is a potential health hazard and a matter of grave concern for consumer.
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